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Quartile Deviation (QD)
The quartile deviation is half the difference between the upper and lower quartiles in a distribution. It is a measure of the spread through the middle half of a distribution. It can be useful because it is not influenced by extremely high or extremely low scores. Quartile Deviation is an ordinal statistic and is most often used in conjunction with the median.
why we calculating quartile deviation?
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When should you throw out an outliers?
If the result is 1.5 x Inter Quartile Range (or more) above the Upper Quartile or 1.5 x Inter Quartile Range (or more) below the Lower Quartile.
Who do you work out the upper and lower quartile?
you do work out the upper and lower quartile
What is the interquartile range equal to?
It is the upper quartile minus the lower quartile.
What is a quartile?
values that divide a list of numbers into quaters is called a quartile.
What is the interquartile range of a number?
the IQR is the third quartile minus the first quartile.
